The storage has a default quad map <http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap>
The quad map provides triples for various graphs named by format <http://www.openlinksw.com/virtrdf-data-formats#default-iid-nonblank>.The data come from DB.DBA.RDF_QUAD

This pre-defined storage is used internally for SERVICE {...} clauses of SPARQL queries; not for regular use.

The storage contains no RDF Views.

The storage has a default quad map <http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap>
The quad map provides triples for various graphs named by format <http://www.openlinksw.com/virtrdf-data-formats#default-iid-nonblank>.The data come from system procedure views that compose and send HTTP requests to remote SPARQL service endpoints and then parse answers

Storage <http://www.openlinksw.com/schemas/virtrdf#SyncToQuads>

This pre-defined storage is to enumerate quad maps mentioned by triggers based on RDF Views; these triggers track changes in source tables of RDF Views and materialize updated content of views as "physical" triples.